ring binder

noun
a loose-leaf binder in which the sheets are held in by two or more rings that can be made to snap open.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
ring binder
 
n
a loose-leaf binder fitted with metal rings that can be opened to allow perforated paper to be inserted

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Otis suggests placing a laptop on a three-ring binder or other object to raise
  it up.
The prototype vaguely resembled a three-ring binder, with eight flexible,
  double-sided pages bound by an aluminum spine.
The report is written on lined notebook paper and clipped into a weathered
  three-ring binder.
If you ever tried to cram too much into a three-ring binder, you know that the
  binder sometimes falls apart in your briefcase.
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